Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Isochrones"”.
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Precision CCD photometry of globular clusters
… upon the cluster main sequence. Theoretical isochrones are employed to show that this spread in colour is consistent with a main sequence metallicity distribution similar to that seen in more highly-evolved stars within the cluster. The age of the cluster is determined as 16 +3 Gyr, by …
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Folding of stratigraphic layers in ice domes
… I use to study overturning are core-relative isochrones (precores) and the deformation gradient tensor along a particle path. This tensor is used to calculate the rotation of stratigraphic segments of various orientations. It is also used in a stochastic model to derive the probability …
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Modelling interstellar extinction in stellar populations
… is an application of these functions to generic isochrones in multiple photometric filter systems. This was followed by an application of the extinction-ratio functions to the highly-reddened star cluster NGC 6793 whose members also have accurate Gaia parallax measurements. When a proper analysis …
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Population Synthesis Models for IMF studies
… a new set of PSMs constructed using theoretical isochrones and two state-ofthe-art synthetic spectral libraries. The BT-Settl and Munari libraries were chosen for their ability to predict the observed values of Lick-type and IMF-sensitive indices in individual stars of the solar neighbourhood. …
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Setting the Holocene clock using varved lake sediments in Sweden
… dating methods, i.e. radiocarbon dating, tephra isochrones and paleomagnetic secular variations were established for two sediment sequences in Värmland. These are the longest geological records with an annual resolution known to exist in Sweden. Three mid-Holocene Icelandic tephra horizons were …
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Optical spectroscopic studies of two star forming regions
… were compared with theoretical tracks and isochrones for pre-main-sequence stars to estimate ages and masses.</p> <p>Both regions have similar median ages, supporting the idea that star formation is a relatively fast process. In ρ Ophiuchi, no age spread was found. In Serpens, an age spread …
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A spectroscopic and photometric study of stellar populations in a sample of clusters in the Magellanic Clouds
… between the observed CMDs and theoretical isochrones. The determination of the age of a stellar population requires an accurate measure of the Main Sequence (MS) Turn-Off (TO) luminosity and the knowledge of the distance modulus, reddening and overall metallicity. For this purpose, we …
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AN OBSERVATIONAL STUDY OF LOW-MASS STAR FORMATION IN NGC 2264
… temperatures. The theoretical mass tracks and isochrones of Cohen and Kuhi (1979) are adopted and extrapolated to lower luminosities and temperatures. The effects of circumstellar dust and gas shells on the location of the NGC 2264 stars in the H-R diagram are examined. No systematic biases in …
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Predicting the Market Share of a New Airport in Multi-Airport Cities: the Case of Lagos
… and the proposed second airport. Further, isochrones and passenger stated preference data were analyzed for the determination of the LIA’s catchment areas for the business and non-business segments of the Nigerian market as well as the areas of spatial competition between MMIA and LIA. With …
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Development and Evaluation of a Gis-Based Spatially Distributed Unit Hydrograph Model
… The cumulative travel time map is divided into isochrones which are used to generate a time-area curve and the resulting unit hydrograph. Predictions of the SDUH model along with the Snyder, SCS, and Clark synthetic unit hydrographs were compared with forty observed storm events from an 1153-ha …
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Incorporating Spatial and Temporal Variation of Watershed Response in a GIS-based Hydrologic Model
… estimated for each cell in the watershed and the isochrones of equal travel time are developed. The time-area curve is developed in the form of an S curve. The spatially distributed 1-hr unit hydrograph is derived from the S curve as the difference between the S curve and its value lagged by 1-hr. …
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Understanding massive disk galaxy formation through resolved stellar populations
… and show its limitations. A comparison with isochrones shows reasonably good agreement with BaSTI models, a small offset to Dartmouth models, and a larger offset to Padua models. Even for the best globular cluster data available, the metallicity of a simple stellar population can be …
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Resolved stellar populations: watching galaxy evolution in real time
… metallicities that were interpolated from PARSEC isochrones (Bressan et al., 2012). Field stars were rejected based on the proper motions from GAIA, which reduced to 18 the number of mass-losing candidates. The large amount of field stars excluded from the sample is due to the difference in …
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El drenaje subterráneo en el acuífero kárstico del cañón del río Lobos (Soria-Burgos)
… aquifer. By the approximated estimation of the isochrones, a perimeter protection of the quality of subterranean water has been established, where the whole aquifer is in the zone of maximum restrictions, since the residence time is inferior to 50-60 days. Finally, it is close to the …
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Castles and Communities: Using the taskscape to explore the attitudes, activities, and lived experience of wider communities in castle landscapes between 1050 - 1550.
This thesis utilises the concept of the taskscape to explore the impact of the medieval castle in England on lived experiences in the landscapes surrounding them between 1050 to 1550. Recent shifts in the focus of castle studies have demonstrated the need to focus on castles as sites of everyday …
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Castles and Communities: Using the taskscape to explore the attitudes, activities, and lived experience of wider communities in castle landscapes between 1050 - 1550.
This thesis utilises the concept of the taskscape to explore the impact of the medieval castle in England on lived experiences in the landscapes surrounding them between 1050 to 1550. Recent shifts in the focus of castle studies have demonstrated the need to focus on castles as sites of everyday …